it's obvious that slowly but sure, Yoroizuka become laxer on her own principles. I remember on earlier chapters that she won't do anything weird with Kurumi due to she still a minor. but now, not only she agree to sleep together (technically speaking tho, not really do it

), she also hopes to be kissed by Kurumi! too bad Kurumi thinks that Yoroizuka wants to be head patted. not that she complaining tho, she enjoyed it too
